Support for electric-lamp filaments.



R. D. MAILEY..

SUPPORT FOR ELECTRIC LAMP FILAMENTS.

APPLICATION FILED JUNE 27. 1914. 1,270,856.

Patented July 2, 1918.

2y INVENTOR 5 BY 3 44 ATTORNEY WITNESSES UNITED STATES OFFICE.

noY D. MAi'I-EY, or EAST onAnGE, NEW JERSEY, ASSIGNOR 'ro coorEn HEWITT ELEC- rnIo COMPANY, 01 HOBOKEN, NEW JERSEY, A CORPORATION OF N W JERSEY.

Specification of Letters Patent.

surroza'r Eon ELECTRIC-LAMP FILAMENTS.

Patented July 2, 1918.

Application filed June 27, i914. Serial No. 847,601.

To all whom it may concern:

Be it known that I, RoY D. MAILEY, a citizen of the United States, and resident of East Orange, county of Essex, State of New 5' Jersey, have invented certain new and useful Improvements in Supports for Electric- Lamp Filaments, of which the following is a specification.

My invention is desi ed as an improvement on an invention of lirederick G. Keyes covered by an application filed June 26th, 1914, Serial Number- 847,403. It relates broadly to the support of a heavy tungsten filament in a so-called tungsten lamp. The filament is supported within a globe having a reduced extension and it has been the practice to Keyes to mount within the mouth of the extensiona disk of aluminum or other suitable metal constituting an intermediate zo'support "for the mainleads from the filament terminals and the direct support for angular rods or wires adapted to hold up the filament at various points along its length. Owing to the fact that the filament is of comparatively large size and heavy weight, the support through the anchors and leads are an important feature of the lamp as a whole.

I have carried the Keyes invention a step further bi employing two disks of aluminum or other metal, the same being ri 'dly connected with each other and bothfy ing within the reduced extension of the main lamp globe. It will be seen that by these 36 means all danger to seals and filament by the tipping 0r displacement of the filament leads and anchor isremoved and the filament and leads are steadily supported and held as rigidly as is necessary for long continued 40 operation.

My invention is illustrated in the accompanying drawings in which Figure 1 is a vertical section of a lamp embodying my invention, a portion of the lamp globe being shown in full lines; and Fig. 2 is a detail perspective of the aluminum disk support.

The globe is shown at 1 and the reduced extension at 2. The filament 3 is supported at its ends by leads 4, 4, passing up through insulating sleeves 5, 5, in a disk 6 of aluminum or other suitable metal. .To preventthe sagging of the filament, anchor rods or wires 7. 7, are secured to, but insulated from the disk 6 and carried up to a corresponding 56 disk 8 and is insulated by insulating sleeves 5, 5, as in the case of the main lead wires vibration (a) taking up the thrust by 4, 4. The anchor wires 7, 7 may be made of nickel steel provided with tip portions 9, 9, of tungsten or other refractory metal in the form of wire. By bending the wire around thefilament the same is supported at the point of contact.

The seals of the lamp are shown at 10, 10, within a reentrant portion of the extension 2 and the leads 4, 4, are directly connected through a suitable core material with the seals and with caps 11, 11, in which the seals terminate. Connection with the outer circuit is made bymeans of wires 12, 12. The disks 6 and 8 are rigidly joined to ether by means of posts 13, 13, orother o the mechanical supports. When the disk is employed, the thrust due to lateral vibration is taken up at the plate rather than at the seals and a tendency of the plate 6 to cant is removed by the use of the second plate. Moreover, the added plate serves as a protection againstthermal radiation from the first plate which might otherwise deleteriously affect the seals. In this way the seals are .kept perfectly cool. It will be understood that the anchors and leads are insulated from the plates, and are attached to the upper or' added plate 8.

The two disks 6 and 8, together with the posts 13, 13, form,'as stated above, a structure calculated to resist lateral vibration and, this structure, being supported within the extension 2 receives support from the walls thereof tending to maintain the disk in an unchanged, lateral position. Depending from a reentrant portion, 14', of the extension, 2, is an arbor, 15, either sealed to or formed in one piece with the said reentrant portion. The arbor is provided with an upset portion, 16, while the two disks are provided with a sleeve, 17, having a split expanded portion, 18, the latter being adapted to cover and engagethe upset portion of the arbor. The disks with their sleeve may be passed over the arbor and the engagement of the expanded portion of the sleeve with the upset portion of the arbor having taken place the whole may be firmly fixed in position by a wire, 19, securely twisted around the fingers of the split expanded portion.

To recapitulate, the advantages of the structure composed of two disks are (a) greater rigidity (b) relieving the efi'ectstfif e loads at the added plate rather than at the seals (d) relieving the tendency to cant which-exists when a'single disk or plate is employed and (e) keeping the seals cool by preventing the efiects of thermal radiation from the single plate used by Keyes. V

I claim as my invention:

1. In an electric lamp, a container and a tubular extension thereof, a heavy filament of tungsten supported Within the container,

the supporting means consisting of disks spaced apart and rigidly secured together within the said extension, and the filament being supported at its ends by the said disks as intermediate means of support, and anchors holding up the filament at various points, the said anchors being directly supported by the saiddisks.- I

2. In an electric lamp, a container and a tubular extension-thereof, a heavy filament of tungsten supported Within the container, a nonconducting arbor centrally disposed within the tubular extension and anchor wires connected With different parts of the filament and disks spaced apart but rigidly connected with each other and jointly supporting the said anchor Wires, said disks being providedwith a sleeve, and means for attaching the sleeve to the arbor.

3. In an electric lamp, a container and a tubular extension thereof, a heavy filament of tlmgsten supported Within the container, a nonconducting arbor centrally disposed within the tubular extension and anchor wires connected'with difi'erent parts of the filament, and. insulated disks spaced apart but rigidly connected with each other Within the said extension, the said arbor being provided with an up-set portion and the said disks being provided with a sleeve surrounding the arbor and adapted to engage the said up-set portion.

y t. In an electric lamp, a container and a tubular extension thereof, a heavy filament of tungsten supported Within the container, a nonconducting arbor centrally disposed within the tubular extension and anchor Wires connected with different parts of the filament, and insulated disks spaced apart but rigidly connected with each. other Within the said extension, the said arbor be ing provided with an up-set portion and the said disks being provided with a sleeve sur-' rounding the arbor and adapted to engage,

' idly connected together to form a long bearing and reduce the liability to lateral displacement thereof with relation to the extension of the container.

6. A heavy filament of tungsten, a globe surrounding the same, a reduced extension of the said globe, in combination with filament-carrying disks spaced apart and rigidly connected With each other within the said extension and seals at the terminus of the extension, whereby the effects of high temperature on the seals are lessened and the filament is held secure -from lateral displacement. i

Signed at New York in the county of New York and State of New York this 25th day of June A. D. 1914.

ROY D. IMAIIQEY,

Witnesses:

Tnos'. H. BROWN, H. B. WOODWARD. 

